Wouldn't it be better to use a numbering similar to most software numbering schemes?
x.yy
where x is the main version und yy a subversion numbering for minimum changes?
Then it would be clear, that most documentation/tutorials for eg. 4.17 are still useable if you want to build 4.18
Usually documentation can't be reworked as fast as there are small changes with the design or the BOM.
Mike
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